. To construct a ray diagram we use two light rays which are so chosen that it is easy to know their directions after reflection from the mirror


List these two rays and state the path of these rays after reflection. Use these two rays to locate the image of an object placed between infinity and the centre of curvature of a concave mirror.

 

Best Answer

Ans.The rays for obtaining image from the mirror after reflection are so chosen that it is easy to know their directions after reflection from the mirror.

 (i) A ray parallel to the principal axis, after reflection passes through the focus in concave mirror  or  appears  to pass through the focus in convex Focus in mirror.

(ii) A ray passing through  the principal focus of a concave mirror or directed  towards the principal focus in convex mirror  after  reflection  will emerge   parallel   to the principal axis.

(iii) A ray passing through the centre  of curvature  of the-concave mirror or directed in the direction of the centre of curvature of

the convex mirror is reflected back along the same path after reflection.

to construct a ray diagram

When the object is placed between infinity and the centre of curvature of a concave mirror.

when object is placed between infinity

 

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